refactor: position logic

lib/game/components/bonus_word.dart

@@ -77,36 +77,31 @@ class BonusWord extends Component with BlocComponent<GameBloc, GameState> {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    final letters = GameBloc.bonusWord.split('');
-    final rightSide = Vector2(-1, 1);
-    final bottomOffset = Vector2(-12.92, -1.82);
-    final midOffset = Vector2(-8.33, 0.65);
-    final topOffset = Vector2(-2.88, 1.75);
-
-    final letter0 = BonusLetter(letter: letters[0], index: 0)
-      ..initialPosition = _position + bottomOffset;
-    final letter1 = BonusLetter(letter: letters[1], index: 1)
-      ..initialPosition = _position + midOffset;
-    final letter2 = BonusLetter(letter: letters[2], index: 2)
-      ..initialPosition = _position + topOffset;
-    final letter3 = BonusLetter(letter: letters[3], index: 3)
-      ..initialPosition = _position + (topOffset..multiply(rightSide));
-    final letter4 = BonusLetter(letter: letters[4], index: 4)
-      ..initialPosition = _position + (midOffset..multiply(rightSide));
-    final letter5 = BonusLetter(letter: letters[5], index: 5)
-      ..initialPosition = _position + (bottomOffset..multiply(rightSide));
 
+    final letters = GameBloc.bonusWord.split('');
+    final positions = [
+      Vector2(-12.92, -1.82),
+      Vector2(-8.33, 0.65),
+      Vector2(-2.88, 1.75),
+    ];
+
+    final mirroredPositions = positions.reversed
+        .map((position) => Vector2(position.x * -1, position.y))
+        .toList();
+    positions.addAll(mirroredPositions);
+    assert(positions.length == GameBloc.bonusWord.length, 'Invalid positions');
+
+    for (var i = 0; i < GameBloc.bonusWord.length; i++) {
       unawaited(
-      addAll([
+        add(
-        letter0,
+          BonusLetter(
-        letter1,
+            letter: letters[i],
-        letter2,
+            index: i,
-        letter3,
+          )..initialPosition = positions[i],
-        letter4,
+        ),
-        letter5,
-      ]),
       );
     }
+  }
 }
 
 /// {@template bonus_letter}